mining only. If I'm unlucky enough to stumble upon a cave, I plug up my mine for a good 20 blocks and head off in another direction, to make sure I don't end up in one.
I use iron for all my mining. Diamond is only for pickaxes to mass mine obsidian, maybe a sword if I feel I need it. Why? Because iron is common enough that you know you won't end up with that akward gap where you're stuck with stone.
to those complaining about "scrap shacks" Remove the s in scrap. Teehee! : They were not history's idea. They are from what little of the textures and lore doku had.
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But seriously. It's a cloud. these things:
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Static clouds.
Clouds won't move.
Partical ammounts.
high-the current ammount.
medium-2/3 the current ammount.
low-1/3 the current ammount.
none.
Turning off fog.
turns off the fog and simply cuts off the render distance, saving cpu usage. (It worked for runescape.)